dynamometric testing for AC& DC electric motors

[petronila]

Hello Friends,

I am interesting in to know about the different and recommended Dynamomtric test availables for AC and DC electric motors.

Thanks for the Inputs.

Regards

Petronila

 

[Connection]

Hi Petronila,

Dynamometric testing is different for a large variety of motors. One can also get many types of dynomometers such as hydraulic, electro-magnetic, frictional.

Please be more specific about the type of motor, its mountings, the type of cooling the motor usually needs and what you are hoping to achieve with the tests. Some people such as rewinders need to prove efficiency, others want to prove the load handling capability or over load conditions.

Regards

 

[blacksea]

The dynamometer based load simulation system for electric motors from well known manufacturers as Magtrol, Huco and Himmelstein, are very expensive. The thermal model based method of motor SOA testing maybe suggested. This method was designed by R.H.Welch Jr., well known motor designed and expert.

 

[petronila]

Thanks for the Inputs,

Specific needs are for prove efficiency at some loading conditions in a motor repair shop

Regards

Petronila

 

[jraef]

Most of the one's I have seen in motor shops have been self made versions, essentially a system of coupling the motor to be tested to another motor that either regenerates into a load bank (i.e. resistor bank, water brakes, eddy current clutch), or has another VS drive system running it such as a 4 quadrant DC drive or AC Flux Vector drive. If you want verifiable test data, I would probably go buy something already made, you could get lost in the details of instrumentation, data recording and extraction. Most of the dynamometer systems come with all that (and a bag of chips). This company makes all the various parts individually so that you can pick and choose which ones you want to do yourself. I used them once just for the instrumentation package on an engine test stand where I did the VFD and mechanical coupling parts, it made it very easy. If I had to do it again I probably would use their mechanical mounting system too, that was a lot of work to get it right.

http://www.taylordyno.com/elec/elec.html

JRaef.com
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[elmotor]

Petronila,

you wrote "Specific needs are for prove efficiency at some loading conditions in a motor repair shop". As you probably know there different standards for determination of efficiency mainly as IEC or IEEE, so should you follow these ones or simply the efficiency "input/output"?

If IEC 60034-2 should be followed, that is the simpliest one. IEEE 112 Method B requires more.

 

[EdDanzer]

I tested a Fanuc spindle drive with a piston hydraulic pump, gear flow meter, pressure transducer and relief valve to find a wide torque variation over a 100 rpm range. There are torque measuring devices that would provide an even better range of rpm and accuracy.

 

[aolalde]

The size of the motors that you will test define the dynamometer type and investment.
Remember that the first requirement is the electric power supply capacity. See

http://www.magtrol.com/motortesting/dynamometers.htm

for some information.